Up for sale is a set of front adjustable camber kit for the Mercedes R230 and R231 models SL350, SL400, SL500, SL550, SL600, SL55, SL63, SL65. These are use with the original ABC suspension system. These kits are fabricate in the United States. The rod is made of steel with Energy Suspension poly bushings. The bushing sleeves are made of aluminum alloy. The ball joint is stainless steel with custom cnc machine sleeves.
These camber kits are great for correcting negative camber - when the top of the wheel is tipped in towards the body. Camber is the tilt of the wheel along its vertical axis. Running wider tires or car with lowering springs can cause this issue where your tires are wearing out on the inside. They are also great for older cars where the suspension tends to sag hence the wheel looks "spray out".
To some degree, this is a good thing as it allows more of the tire tread to stay in contact with the ground during hard cornering. But if you have too much negative camber, which degrades cornering performance as well as hinders grip during hard acceleration. 
The camber kit can straighten the wheels by dialing out the negative camber, something you can't do with the stock suspension.
Like wise, if you want more negative camber, this kit can put the wheel further in, allowing more camber for those of you who would like to have the "tuck-in" and slammed look:)
Please let me know what model R230 you have on the note section when you order so I can get you the correct configuration. Thanks.